Haven't been around for long, but this guy is awesome for an 18y halfway though the season. Great height for outside+inside training as well.
Why don't you build all of his skills to let's say 10(prominent), and then finish off training with whatever you want at that time. You could make him uber salary efficient.
It would also be convenient, since you're in the lower league, and can't maintain big salaries.
What about this final build?
14/10
13/10
13/13
13/10
10/10